In his excellent and definitive book, "The New York Public Library Its Architecture and Decoration, published in 1986 by W. W. Norton & Company, Henry Hope Reed describes this correctly as "an edifice of stunning quality - a people's palace of triumphant glory."
"Astor Hall, at the entrance," Reed continues, "with its unique stone vault above an awesome white marble interior, sets the tone for the architectural delights that lie in store for the visitor. Sumptuous light brackets, elaborately decorated ceilings, the great gallery extending along the north-south axis of the building on the first floor, the window bays, the doorways, the great stairways, all combine to lift the human spirit and dignify man's achievements. The elaborately decorated Main Reading Room, almost two city blocks in length, located at the top of the building for light and quiet, is a fitting climax to all that the architects wished to achieve."
With McKim, Mead & White's demolished Pennsylvania Station and Warren & Wetmore's and Reed & Stem's Grand Central Terminal, the library is one of the most important Beaux-Arts structures ever erected in midtown. It has neither the incredible spaciousness drama of the former or the great location straddling Park Avenue of the latter, but it surpassed both in its consistently lavish decorative detail. The former Custom House at the foot of Broadway and the former Hall of Records building on Chambers Street, both downtown, are far greater Beaux Arts buildings, but much smaller, though still imposing.